/Engine/Source/Runtime/Engine/Public/HLSLTree/HLSLTree.h
Get Shader/Preshader/Constant value for the expression
[FEmitShaderExpression](API\Runtime\Engine\HLSLTree\FEmitShaderExpression) * GetValueShader ( [FEmitContext](API\Runtime\Engine\HLSLTree\FEmitContext) & Context, [FEmitScope](API\Runtime\Engine\HLSLTree\FEmitScope) & Scope ) const